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Business combinations and disposals - K-12 Education (Details) - USD ($) $ in Thousands |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
May 09, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2014
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Gain on disposal |  |  |  |  |  |  |  |  |  | $ 6,880 | $ 0 | $ 0
Revenue |  | $ 623,091 | $ 617,094 | $ 606,453 | $ 556,722 | $ 578,683 | $ 572,301 | $ 481,794 | $ 467,043 | 2,403,360 | 2,099,821 | 1,700,912
Operating income (loss) |  | 81,308 | $ 84,609 | $ 77,900 | $ 42,786 | 61,527 | $ 71,067 | $ 62,007 | $ 65,231 | 286,603 | 259,832 | 225,308
Identifiable assets |  | 1,348,819 |  |  |  | 1,271,558 |  |  |  | 1,348,819 | 1,271,558 |
Liabilities |  | $ 595,679 |  |  |  | 655,859 |  |  |  | 595,679 | 655,859 |
K-12 Education |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Gain on disposal | $ 6,900 |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  | 2,200 | 4,700 | 9,400
Operating income (loss) |  |  |  |  |  |  |  |  |  | $ (200) | 900 | $ 2,800
Identifiable assets |  |  |  |  |  | 1,500 |  |  |  |  | 1,500 |
Liabilities |  |  |  |  |  | $ 2,700 |  |  |  |  | $ 2,700 |

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